问题
单项选择题
Shall we（）wait at the roadstead till there is a free berth for us?
A.must
B.ought to
C.have to
D.never
答案
参考答案：C
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Shall we（）wait at the roadstead till there is a free berth for us?
A.must
B.ought to
C.have to
D.never
参考答案：C